An upper-low will continue to build in the Pacific Northwest and this will keep temperatures about 5-10 degrees below normal through Thursday. This low will return the marine layer to areas of the coast and also provide more cloud cover through Thursday, breezy winds and a slight chance for isolated light showers to the northwest section of our viewing area including Coos and Douglas counties and the northern Cascades. There is weak instability in the northern Cascades and east Lake county Wednesday and Thursday evenings which may cause some thunder, it’s a slight chance but the potential is there.
The upper-low will exit the region Friday bringing a jump in temperatures by about five degrees then another upper-low replaces the previous one on Sunday which brings in a more widespread threat for thunderstorms on Father’s Day. The thunderstorm potential will exist across the region with the favored spots over the higher terrain. Any storms on Father’s Day Sunday will be relatively dry with a better chance for some showers on Monday as well as thunderstorms. Some isolated showers could continue into Tuesday but the threat for thunderstorms will diminish.
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Meteorologist Megan Parry